It functions like this:
- The switch sends a turn-on signal to the multitimer. He gives gok to relay K1.
- Relay K1 passes current to the heated rear window.
- After about 15 minutes - if not turned off earlier - the multi-timer interrupts the current supply to the relay. It opens its contacts and, in turn, interrupts the current supply to the glass.
If there is no voltage, check relay K1.
If nothing happens despite a good relay, check the heated rear window switch as described above.
If everything was in order so far, the only source of the malfunction is the multi-timer or a break in the wire - mainly in the transfer area from the body to the rear window - check.
The multitimer cannot be tested by amateur means.
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